Patent Number: 7,088,033

Title: Electrodeless fluorescent lamp with stabilized operation at high and low ambient temperatures

Abstract: An electrodeless lamp includes a bulbous lamp envelope enclosing an inert gas and a vaporizable metal fill, the lamp envelope having a reentrant cavity and an envelope bottom, an electromagnetic coupler positioned within the reentrant cavity, and a thermal shield positioned in proximity to the envelope bottom and configured to increase the temperature of the envelope bottom. By increasing the temperature of the envelope bottom, a cold spot is prevented. As a result, light output at low temperatures is comparable to light output at room temperature.

Inventors: Chandler; Robert T. (Lexington, MA), Popov; Oleg (Needham, MA), Maya; Jakob (Brookline, MA)

Assignee: Matsushita Electric Works Ltd.

International Classification: H01J 1/02 (20060101)

Expiration Date: 8/08/02018